SCOTTSDALE, Ariz. — Jake Arrieta has taken his beard and his breaking balls from the North Side of Chicago to South Philadelphia. The old Miami Marlins outfield has scattered to the Bronx (Giancarlo Stanton), Milwaukee (Christian Yelich) and St. Louis (Marcell Ozuna). And if you’re sitting in the Green Monster seats at Fenway Park, look out, because a guy nicknamed Just Dingers — J. D. Martinez — has come to town.

But the most celebrated newcomer of 2018, at least for nostalgic fans over 40, can be found in the bullpens at Chase Field in Phoenix. They are E-Z-Go golf carts, with an outer shell made to look like a baseball with a black Arizona Diamondbacks cap on top. Yes, the bullpen cart, that charming vestige of the 1970s, is back.

“I’ve never thought of being driven into a game, so it’s a little weird concept, but I think it’s pretty cool,” said Archie Bradley, the Diamondbacks’ ace reliever. “We have some creative minds out in the bullpen. We’re already talking about tricking this thing out — subwoofers, underglow lights. And I definitely want to drive guys in. That would be sick.”

Alas, the Diamondbacks have hired four game-day staffers to drive the cart, and so far, the only add-ons are logos for OnTrac, a shipping company based in Chandler, Ariz., that signed a six-figure sponsorship deal. Derrick Hall, the Diamondbacks’ president, said pitchers would have the choice to be driven from the bullpen or trot in, as usual.

“You know how superstitious baseball players are,” said T. J. McFarland, a Diamondbacks left-hander. “The first guy who goes out there in a cart and ends up having a really bad outing, is he going to do it again? I don’t know.”

Mike Fetters, the Arizona bullpen coach, pitched for the Milwaukee Brewers in 1995, believed to be the last time a team used a vehicle to transport relievers. In the Brewers’ case, it was a Harley-Davidson motorcycle with a sidecar for the pitcher — or, at least, the pitcher’s warm-up jacket.

“Two guys that used it got lit up, and no one ever used it again,” Fetters said. “But it was there, so the guy would just take the jacket, drive it around, drop it in the dugout and come back.”

Hall said several other teams had asked about the cart, and he believes it will catch on around the league, especially as baseball looks for ways to shave time off an increasingly slow-paced game. Fetters, 53, is cautiously optimistic.

“This generation of player, they like different, and it’s kind of cool,” he said. “I mean, I thought it was cool when I was a kid watching baseball — here comes a hat, right? So we’ll see. If it doesn’t disrupt the game and how they’re doing, performance-wise, I think it’ll be all right.”

A version of this article appears in print on , on Page B13 of the New York edition with the headline: There’s a Drive! (It’s Coming From the Bullpen). Order Reprints | Today’s Paper | Subscribe